Some cab shots:
http://www.trainsarefun.com/lirr/lirrcab.htm
ALCO C420 control stand c.1968 (Jay Bendersky-Robert Anderson)
ALCO C420 CONTROL STAND
1) Throttle-idle position
2) Dynamic Brake handle-locked out not used
3) Automatic Brake valve-train brake
4) Independent Brake valve-full applied position
5) Head Light switch-rear
6) Head Light switch-front
7) Bell valve
8) Console Light
9) Manual sander valve
10) Console Light
11) Emergency fuel cut off switch
12) Switches-Control-battery-generator field-fuel pump
13) Reverser
14) Air brake gauge-Main Res/Equalizing res
15) Air Brake gauge-Brake pipe/Brake cylinder
16) Air Brake gauge-Supression air
17) Air Brake gauge-Timing Air
18) Amp gauge-Traction
19) Two Horn chains encased in rubber hose-city/country(1)
20) Brake pipe regulating valve
21) ABVCOC (Automatic Brake Valve Cut-Out Cock)
22) Independent brake regulating valve
23) MU2a valve-multiple unit/lead-dead
Note (1): There were two ropes with a length of rubber hose (about 18" each) on them where you would pull them down to sound the horn. One was for the "City" tone, which was lower in volume than the other, "Country" tone which was louder. Both ropes led to separate valves on the cab ceiling. If you grabbed them both together, you could make even more noise.
Further trivia: Because of clearance issues at various locations, the horns were mounted on the engineers side of the car body, on the side (not the top) of the engine, just ahead of the smoke deflectors.