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The circuit diagram below is of the railway's hand-held controllers.
All the parts should be available via either RS Components or Maplin.

Railway Controller Circuit Diagram

Component Description RS Cat. No. Maplin Cat. No.
R1-R3 10kW resistor 131-839 M10K
VR1 10kW linear potentiometer 855-462 JM85G
 
D1 LED (Red) - any size
D2 1N4148 diode 271-606 QL80B
D3-D7 1N4002 diode 261-154 QL74R
D8 LED (Green) - any size
 
C1 10mF / 25V capacitor 267-5139 AT02C
TR1 BC337 transistor 131-1430 QB68Y
TR2 MJE3055 transistor 313-6916
 
CB1 1 amp circuit breaker
 
S1 Switch (DPDT) - ON-OFF-ON 330-991 (toggle) FH05F
 
  Heatsink (for TR2) 234-2328 KU50E

NOTE: a heatsink must be connected to TR2 to prevent it overheating.