Im running a 11x18 carpet layout..using mth 750 transformer..train speeds up when it half way comming back to me.....wondering if I got to run another set of track power to the other side of the room??
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If you only have one feed right now, yes. What gauge wire are you using for the feeds? On something that large you may want to go with a third feed. That's roughly 50 linear feet of track. One feed per 12-15 foot of track is pretty common, especially for sectional track.
It sounds like you need a good feed to the other side of the layout, yes.
You don't mention what type of track you use, but particularly if it is hollow-rail (Fastrack of traditional O-27 as opposed to solid-rail track like Atlas) it's a bit more necessary to feed it at several intervals around the loop, if you want good steady voltage and smooth running.
My personal rule of thumb is to have a feed every ten feet: which means you would ideally have about five locations on your loop (I'm thinking an 11 x 18 loop would be about 50 feet of track). You can very often get away with far more distance between feed points than that, particularly if solid rail, but I make it a practice do so even when using Atlas, etc. Good feeder wires and routine intervals of ten to twelve feet, using a robust wire size, assures you of dependable power feed with low voltage drop around a loop even when running very power-hungry trains. And that tends to "curve" many maladies that otherwise crop up from time to time.
Install a second feed - to the other side of the layout, using #14 or #12 wire, and it will probably cure the problem.
Im running O 72 tubular tracks..high rail tracks..running scale O 72..steamers
Lee pretty well summed up the correct remedy.
There is a Micky Mouse way to even out the train speed on a relatively smallish loop. Attach one wire to one rail at the 6 o'clock position and the other wire on the other rail half way around the loop at the 12 o'clock position.
Use 5 o'clock and 11 o'clock during Day Light Savings. 
Feeds on the far end of the layout definitely help and are recommended. I currently run 28' x 16' loops with Gargraves track and only one feed and the voltage drop at the extreme end is only about 1.5V but also losing some current. I attribute the small loss to my habit of tightening each track joint with a end cut or track pliers. I will get around to adding a second feed but right now the slowing of the train isn't really terrible. The steel used for track is not a highly efficient electrical conductor (as copper is) and on large layouts there will always be voltage drops
I would also include another ground feed at the far end. It helped me with the same track and problem.
thanks guy..it worked ....now just need a bigger transformer..
