Just had a silly idea, if you put a touch rail in front of a booster rail, wouldn't it activate that booster when you go over the touch rail? It may put strain off the server as redstone-torches don't burn all the time.
edit: tested, works like a charm!
Redstone doesnt 'pulse' without a clock, its simply on and so is anything attached unless there is a change. I don't think a single torch would actually add any load, its just 'on' and so are the rails next to it. There is no chunk change, and so server doesnt send any extra info. Presure rail, while it looks nicer, does force a change, both set to on and set to off, theoretically causeing more lag by those two changes (and data sends accordingly) per pressure rail. I doubt it would be noticeable with the chunks loading from minecart travel anyway, but its the same lag concept as a pressure plate in front of a door.
Example:
Torch -
server: torch is on, rail is powered (1st chunk load)
client: minecart passes rail
server: minecart speedup
(minecart speeds up)
pressure rail -
server: pressure 'off', rail 'off' (1st chunk load)
client: minecart passes pressure
server: pressure 'on', set rail 'on'
client: minecart passes rail
server: minecart speedup
(minecart speeds up)
(count down timer for pressure)
server: pressure set to 'off', set rail to off'
This can be seen during times of serious redstone lag when you press the button and nothing happens for a few seconds.
In terms of any lag caused by the animation, that is 100% client-side (as shown by optifine being able to disable it) and cause no
network lag though it may hurt really low-end systems a bit.
Simply put: pressure rails for every powered rail will cause -
more- strain by forcing chunk updates, and torches cause -
no- strain due to the lack of chunk changes.
For a railroad to function properly, is redstone neccesary? If so, anyone interested to help extend the rail line to somewhere in between of trashmania and my territory for dual purpose? Hope to hear if anyone's willing and able to. 
You can just use a switch (1 cobble + 1 stick) set to 'on' to power the rails, though the powered rails themselves still need a bit of redstone. (one per 16 rails, 1 rail per 32ish meters)