British Rail Class 418

British Rail Class 418 (or 2Sap) was a class of electric multiple unit commissioned by British Railways Southern Region. in England. The units were formed in the 1970s by simply declassifying the first class accommodation in selected 2Hap units. They were employed on inner suburban routes such as the Hounslow Loop.

British Rail Class 418
5934 at Virginia Water in 1979
In service	1969-1970, 1974-1980, 1982-1983
Manufacturer	BR Eastleigh
Number built	63 units converted from 2-HAP
Formation	DMBSO - DTS
Operator	British Rail
Line(s) served	Southern Region
Specifications
Car body construction	Steel
Train length	132 ft 8+1⁄2 in (40.450 m)
Car length	63 ft 11+1⁄2 in (19.495 m)
Width	9 ft 3 in (2.819 m)
Height	12 ft 8 in (3.86 m) (overall)
Entry	3 ft 9 in (1.14 m)
Doors	Slam
Maximum speed	90 mph (140 km/h)
Weight	42 t (41 long tons; 46 short tons) (DMBSO) 32.5 t (32.0 long tons; 35.8 short tons) (DTS)
Train heating	Electric
Current collection method	Contact shoe
UIC classification	Bo′2′+2′2′
Bogies	Commonwealth (inner), Mk4 (outer)
Braking system(s)	Air (EP/Auto)
Coupling system	Buckeye (outer) 3 link (inner)
Multiple working	1951, 1957, 1963, 1966 SR Emus
Gauge