[I have NOT checked this against the Westinghouse specs, below; they should match.]

Armco B-71 Westinghouse "Visibility Cab" Switcher

Armco B-71 is one of a handful of diesel locomotives built by Westinghouse during the
formative years of diesel-electric locomotive technology. As such, it represents an
evolutionary step between boxcab locomotives like MTM's Dan Patch 100 and more
functional designs such as EMD's NW-2.

Westinghouse Electric And Manufacturing Co. (WEMCO) had been a major supplier of 
traction motors and electrical gear for electric locomotives for decades, so when a 
market developed for diesel-electrics (which could be thought of as electrics with their 
own built-in power plants), it was only natural for Westinghouse to enter the fray. As with 
the company's straight electrics, the trucks and bodies were subcontracted to the 
Baldwin Locomotive Works. The prime movers were licensed Beardmore designs.

In November 1930, Westinghouse delivered a 70-ton, Oil-Electric locomotive for
switching service, road number B-71, to the American Rolling Mill Co. (ARMCO)
Columbia Division in Butler, Pennsylvania. The order number was 61401. From the
frame down, it was almost identical to B-70 which was a box-cab design intended to
compete with Ingersol-Rand products. Above the frame, the carbody had been
redesigned to offer the engineer better visibility from a raised position. 

According to WEMCO advertising from 1930: 

                    Single Power Plant Oil Electric Locomotives 
                                300 and 400 hp 

   The Westinghouse 300-hp and 400-hp single power plant locomotives each consist of a single cab
      mounted on swivel trucks having an elevated engineman's compartment at one end. The
 engine-generator unit and accessories are contained in a hood forming the remainder of the cab, which
                has recessed side walls to provide visibility for the operator. 

   In the engineman's compartment, windows on all sides and Westinghouse dual control enable the
  operator to move from one side to the other at any time while continually having the locomotive under
                                complete control. 

   The hood contains the engine-generator unit, its supply tanks, control apparatus, battery box, and
 supply cabinet. All of these items except the engine-generator unit and water tank are located under the
 recessed portions of the side walls, thus providing free aisle spaces on all sides of the engine. The fuel
       tanks are mounted horizontally at a height sufficient to afford gravity feed to the engine. 

 The cooling radiators are mounted vertically on the sides and the front at the upper end of the hood with
 a vertical blower arranged to draw air through the sections. The water tank is mounted vertically on the
 hood end sheet directly below the radiators so all water will drain inside the cab on engine shut-down. 

   Sand boxes are located at the four outer corners of the cab, affording direct flow to the wheels. The
 muffler is recessed in the hood roof directly over each engine. Compressors and air tanks are mounted
                         between trucks on the underframe. 

    Safety platforms, switchman's steps and headlights are provided at each end of the locomotive. 

  The hood has windows in each side and a door in each end, the rear door leading to the engineman's
                    compartment which also has an end escape door. 

A few interesting notes about the WEMCO advertising: 

     The 300-hp and 400-hp engines were almost identical. The 300-hp followed the
     Beardmore design, while the 400-hp had a larger bore and higher RPM. 
     The box-cab heritage is evident in their description of the "engineman's
     compartment" and the "hood" together forming the cab - which in preceding
     designs was a single enclosure. 
     The Westinghouse dual-control is an interesting sight. It consists of a standard
     brake stand and trolley-like controller under the floor, connected to two control
     stands above the floor by connecting rods and cables. Their claim of the
     engineman being able to switch seats without loosing control is reasonable - in
     the box-cab design he would be obliged to get up and walk around the
     engine-generator to the opposite corner of the locomotive. 
     There is a typo in the third-to-last paragraph by referring to "each engine." The last
     four paragraphs are almost identical to the advertising of the 600-hp and 800-hp
     models, which consisted of two mechanical packages in two hoods arranged
     back-to-back around a centered engineman's compartment - much like a later
     Baldwin center-cab or a GE 44-tonner. 
     The illustrations (not duplicated here) show a coal stove and coal bin in the cab for
     heat. 
     As built, B-71 looked slightly more streamlined than it does today. The corner
     sand boxes originally looked like extensions of the hood's shoulders. At some
     point their height was reduced about a foot - probably not for aesthetic reasons. 

B-71's as-built specs were: 
 Total weight of unit - 146,200 lb.
 Classification of wheels - B-B
 Weight per driving axle - 36,550 lb.
 Number of driving axles - 4
 Starting tractive effort (30% adhesion) - 43,860 lb.
 Maximum starting tractive effort - 67,000 lb.
 Tractive effort - continuous rating - 20,000 lb.
 Maximum safe speed - 35 mph.
 Track gauge - 4 ft., 8 1/2 in.
 Total wheel base - 25 ft., 8 in.
 Rigid wheel base - 8 ft., 0 in.
 Length overall (coupler knuckles) - 36 ft., 7 in.
 Length of cab - 5 ft., 6 in.
 Width overall - 10 ft., 2 in.
 Overall height of locomotive - 14 ft., 9 in.
 Diameter of drivers - 38 in.
 Engines per cab - 1 - Westinghouse
 Type and fuel - Solid injection - oil
 Cylinders - 6
 Cycle - 4 stroke
 Rating - 300 hp. at 800 rpm.
 Generator - 1 - type 477-B, 625 volts, d-c, direct-connected to oil engine
 Auxilary generator - 1 - type YG-15-A-2
 Number and type of motor - 4 - type 582-FE-6
 Gear ratio - 15:70
 Control - Electro-pneumatic, dual control, series-parallel, parallel. Automatic loading of engine by torque control
 Battery - 64 volts, 204 amp.-hr.
 Compressors - 2 - type D-3-F
 Radiators - Force cooled with automatic control
 Number of this type of unit placed in service - 1
 Year placed in service - 1930

Over the years some modifications have taken place. The original engine was replaced
with a 400-hp Hamilton 68-5A 6-cylinder engine, and the corner sand boxes, which
were the same height as the shoulders, have been shortened.

B-71 is believed to have served the Cadillac & Lake City in Michigan prior to being
acquired by MTM (in 1985?). Of 11 single-engine "Visibility Cab" units built, at least two
(ARMCO B-71 and B-73) survive. B-73 is in operating condition. Predecessor ARMCO
B-70 is also said to survive in Atlanta, Georgia.

Although unrestored and not very attractive as is, B-71 is remarkably complete, and
could conceivably be made operable again. At present MTM is considering a cosmetic
restoration. 

Sources: 

   1."The Second Diesel Spotter's Guide" by Jerry A. Pinkepank; data p. MISC-407 - MISC-411.
   2."Oil Electric Locomotives and Rail Cars" (WEMCO - reprinted in TRAIN SHED CYCLOPEDIA No.43); data p2-3, data & photo p19.

Here is the 1930 Westinghouse catalog data for #B-71:

Total Weight of unit                                                146,200 lb.
Classification of wheels                                            B-B
Weight on drivers                                                   36,550 lb.
Number of driving axles                                             4
Maximum starting tractive effort (30% adhesion)                     43,860 lb.
Tractive effort - continuous rating                                 20,000 lb.
Maximum safe speed                                                  35 mph.
Track gauge                                                          4  ft.,  8½ in.
Total wheel base                                                    25  ft.,  8  in.
Rigid wheel base                                                     8  ft.,  0  in.
Length overall (coupler knuckles)                                   36  ft.,  7 in.
Length of cab                                                        5  ft.,  6  in.
Width overall                                                       10  ft.,  2  in.
Overall height of locomotive                                        14  ft., 11  in.
Diameter of drivers                                                          38  in.
Engines per cab                                                      1 - Westinghouse
Type and fuel                                                       Solid injection - oil
Cylinders                                                            6
Cycle                                                                4 stroke
Rating                                                              300 hp. at 800 rpm.
Generator                           1 - type 477, 625-volt, d-c., direct-connected to oil engine.
Auxiliary generator                                                 1 - type YG-15-A-2
Number and type of motor                                            4 - type 582-FE-6
Gear ratio                                                         15:70
Control       Electro-pneumatic, single-end, multiple unit, series-parallel.  Automatic control
    of engine putput by torque governor
Battery                                                            64 volts, 204 amp.-hr.
Compressors                                                         2 - type D-3-F
Radiators                                           Force cooled with automatic control.
Number of this type of unit furnished                               1
Year placed in service                                             1930

Gopher State Railway Museum Photos of ARMCO B-71 at MTM:

Armco B-71 locomotive outside of Minnesota Transportation Museum.

Armco B-71 locomotive outside of Minnesota Transportation Museum.

As you can see the locomotive needs a lot of help.

Inside the engine compartment.

The control cab.

You can see the engineers seat in the background.

This is the door to the engine compartment.

Engine compartment.
[Photos and captions (adapted) from Gopher State Railway Museum site - all rights reserved to GSRM]

Speaking of colorful, and of the Cadillac and Lake City (noted above in the MTM text), "believed" is no longer the operative word; Tom Gloger sent me this shot ("When I was visiting the Cadillac & Lake City in [late July] 1968 - - - I stuck my flash camera in the door, took a few pictures in random directions, and left.  When the film was developed, I had one shot of a bulgy orange and black object that didn't look like anything I'd seen before."):   (19 Aug 04)

(photo by and courtesy of T. Gloger - all rights reserved)
[Thumbnailed image - click on picture for larger image]
Armco B-71 in shop at Cadillac & Lake City, Jul 1968.