DCC mode is easy, and useful when testing a route.
S W X = stop forward reverse
I prefer driving in Cab mode, with a mile long train, using 6-8 locos total. On my 37 mile grade, proper trainhandling is something that must be adhered to. As a consist gets away from you if you don't brake, or use dynamic braking. Psssssing away your air repeatedly, on a prototype train can lead to "no air" in the resivoirs and trainline, and a runaway. Trainz however is not capable of air loss.
Full Dynamic Braking is
C and can only be set with the throttle in the off postion.
V = sand for traction
S F Q W WWWW = stop forward release = Drive-Throttle 5
On a downgrade (keeping your speed below 25 mph), hit:
S C F W WWWW = Full Dynamic Braking, throttle notch 5
(If driving at a high speed, dynamic braking can take several miles to start slowing a heavy 125 car, 14,000 ton train).
Full Dynamics will slow the head end locos more, than 1/2 Dynamics.
The (bottom) Independant Brake
E handle should (in real life) only be used if a loco has no traincars. (but in Trainz it applys some realistic, added braking).
The (upper) Train Brake,
A AAAAAAAAA, 10 notch's, reduces air in the trainline causing all the railcars to apply brakes.
Emergency Braking (fully forward) is dumping all the trainline air.
P is pause, and really is not a realistic Emergency Brake (Trainz lacks this, as well as a bell switch in the cab, which is
B).
H is Horn/Whistle.
A good speed to maintain is @ 35mph ... and try to brake, release, excelerate, brake, 1 mile before a stop is intended. Trains can't stop on a dime ... except in DCC Mode
Moving the controls by use of the mouse is very challenging, over keyboard operation.