I just got a MTH railking SD70 ACE locomotive. I found a pack with four small rubber like tires in a small bag. What are they used for? Are they for traction when pulling large loads.
Help!
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Those are replacement tires for when you wear out the ones that are already installed.
I'd recommend taping a note to the bag about what loco they go to and putting it in a safe place. Also, don't unseal the bad, the tires will last longer in storage if the bag is not opened. In a few years when the ones installed wear out, you can change out to these.
Unless you run a lot or pull big loads, it'll be years before you have to find out what they're for. 
"How do I add the 4 small rubber Tires to my MTH Railking locomotive?"
This is tricky process... but if you follow these steps you are "good to go":
1) First say a prayer for patients
2) Send the kids out of the room- in case of accidental profanity.
3) Attach your third arm or hand.
4) say another prayer that you can access them without tearing down the entire locomotive.
5) grap 3 tooth picks, or fine metal tweezers to walk the tire around the drivers
6) Say another prayer that you get it on the first time
7) Change both at the same time... usually I change one, get a lap going and the other goes.
8) Put engine back together, hopefully you took photos with your phone or have a good memory here. ( add another prayer here too).
9) Run that locomotive!
I store my replacement tires in Pharmacutical pill bottles.
Yep pills help too...
Doing a search, I ran into this old post and thought I would share this tire tip. Installing diesel traction tires is very easy if you have a chrome plated, 1/2" drive, 7/16" socket. Slip the tire over the small end of the socket and slide it down over the shoulder of the larger end of the socket. Remove the side frame on the wheel truck so that you can hold the large end of the socket against the wheel then just slide the tire off the socket onto the wheel. If you have to purchase a socket to keep on hand for this procedure, be sure it has a chrome finish and not machined galvanize and that the large end is the same diameter or a hair larger then the lip of the diesels wheel. The chrome helps to slide the tire much easier down the socket onto the wheel. This procedure prevents over stretching the tire which causes premature tire failure.
Once the side frames are off, I have no problem at all installing a diesel traction tire in a few seconds with a small flat bladed screwdriver and one finger. Just hold it in place and chase it around with the screwdriver and it's on.
