Rhaetian Railway Gem 4/4

Specifications
Specifications
Configuration:;
• UIC	Bo′Bo′
Gauge	1,000 mm (3 ft 3+3⁄8 in) metre gauge
Wheelbase	2,200 mm (7 ft 3 in)
Length	13,540 mm (44 ft 5 in)
Width	2,700 mm (8 ft 10 in)
Height	3,820 mm (12 ft 6 in)
Loco weight	50 tonnes (49.2 long tons; 55.1 short tons)
Fuel type	Diesel fuel
Electric system/s	1,000 V DC Overhead
Current pickup(s)	Pantograph
Engine type	Four stroke diesel engine
Traction motors	4 (type EMR 475-wound)

Type and origin
Type and origin
Power type	Electro-diesel
Builder	SLM, SWS, BBC, and MFO
Build date	1966
Total produced	2

Rhaetian Railway Gem 4/4
Rhaetian Railway Gem 4/4
	Rebuilt Gem 4/4 802 at Pontresina, 2010.
Power type
Type and origin
Power type	Electro-diesel
Builder	SLM, SWS, BBC, and MFO
Build date	1966
Total produced	2
Configuration:;
Specifications
Configuration:;
• UIC	Bo′Bo′
Gauge	1,000 mm (3 ft 3+3⁄8 in) metre gauge
Wheelbase	2,200 mm (7 ft 3 in)
Length	13,540 mm (44 ft 5 in)
Width	2,700 mm (8 ft 10 in)
Height	3,820 mm (12 ft 6 in)
Loco weight	50 tonnes (49.2 long tons; 55.1 short tons)
Fuel type	Diesel fuel
Electric system/s	1,000 V DC Overhead
Current pickup(s)	Pantograph
Engine type	Four stroke diesel engine
Traction motors	4 (type EMR 475-wound)
Maximum speed
Performance figures
Maximum speed	65 km/h (40 mph)
Power output	Electric: 560 kW (750 hp); Diesel: 780 kW (1,050 hp)
Tractive effort	80 kN (17,980 lbf)
Operators
Career
Operators	Rhaetian Railway
Numbers	801–802
Locale	Graubünden, Switzerland
Delivered	1966
Disposition	Both still in service

The Rhaetian Railway Gem 4/4 is a two member class of metre gauge Bo′Bo′ electro-diesel locomotives operated since 1968 by the Rhaetian Railway (RhB), which is the main railway network in the Canton of Graubünden, Switzerland.

The class is so named under the Swiss locomotive and railcar classification system. According to that system, Gem 4/4 denotes a narrow gauge electro-diesel engined adhesion locomotive with a total of four axles, all of which are drive axles.

The companies involved in building the Gem 4/4s were the Swiss Locomotive and Machine Works (SLM), Schweizerische Wagons- und Aufzügefabrik AG Schlieren-Zürich (SWS), Brown, Boveri & Cie (BBC) and Maschinenfabrik Oerlikon (MFO). The power output of the Gem 4/4s at the wheels is 780 kilowatts (1,050 hp) in diesel operation, and 680 kilowatts (910 hp) under the DC wires.

Closely related to the Gem 4/4s are the two HGm 4/4s that were delivered a year later to the Furka Oberalp Bahn.