I have a J.C. Penney Lehigh & Hudson River Alco C-420 Diesel Locomotive from my uncle to check over for him and as soon as I started it up it threw off two of the dry rotted traction tires. Anyone know the right part number for this engine from 2000?
There are online services that specialize in supplying traction tires by size, and there was at least one post on the old forum with specific contact information.
Does this help?
https;//www.lionelsupport.com/Delaware-Hudson-TMCC-Alco-C-420-Diesel-412-6-18588
Personally I donāt like traction tires. If they fall off and the engine doesnāt miss them I leave them off. Mind you Iāve got a small layout with no grades.
Thanks for the answer, Flintlock, that is what I came up with. Now to find a replacement. Yeah, pulling 13 cars on the elevated loop may be asking a bit much. 
Glad I was able to help!
Iām going to leave this here for anyone who is looking for parts: Toy train parts suppliers - Trains
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Thanks so much Rene! Thatās a BIG help to us all!
I grew up in the Magna-traction era in the 1950s. When I got back into O Gauge in the 1980s, I first saw traction tires on Lionel. Then I bought a āLegacyā reintroduction loco (NH electric) in the early 2000s and it had both magna-traction and 2 wheels with traction tires. Why did Lionel get into tires when they already had a working system with magna-traction?
I believe partially because the tires are much cheaper to produce, and partially because magnetraction only works on steel track, ideally of heavier gauge metal. Traction tires will work great regardless of what material the track is made of.
I suspect cost was the main factor in Lionel initially moving to tires, but the other factors would be why a model might come with both.
-El
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There it is. Considering the other types of track around (Think MTHās nickle-silver RealTrax, among others) for that extra bit of pull needed traction tires are the only answer.
As Iāve said before though I rarely replace traction tires when they wear out, I only do so if the engine misses them.
I am a Trains subscriber, but I buy Model Railroader at a retail outlet as it gets me into the hobby shop, so I canāt get into the above Trains.com MR site. As an alternative here is the Lionel traction tire site, which is an expansion on what Flintlock referenced. Notice that many items are sold out.
Shopping
Mike, you are allowed three articles per month to read free, regardless of your subscription status. It you canāt read that article it means youāve already viewed your three articles for the month.
Rene
Rene, When I open up my Trains page to read the NewsWire I am usually automatically signed in. However, on days when I am not automatically signed in, I read thru the first 3 articles before it tells me I must register or become a member, so I use up my 3 free articles on the Trains page for which I am already a Trains subscriber. It would be nice if there was some way I could get credit for the Model Railroader magazines I buy at the hobby shop.
Thank you for supporting your hobby shop, Mike. You can try a 30 day free trial of Trains.com and then cancel if you donāt like it. Not trying to pressure you, but itās an option.
I know Iām biased, but weāre posting lots of great information. 
The starting place is to print a QR code in each issue of the magazine that grants certain types of access. Youād scan it from inside the login security to confirm that itās a community member rather than someone who would (horrors!) scan the code with a camera in the shop and then not buy a copyā¦
I have to be honest. I stopped putting QR codes in the magazine because no one used them (we tracked the number of scans).
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I was unaware that QR codes could have been used to view subscriber only content.
The QR code just confirms that you had the particular magazine ā when scanned it produces the same sort of āpermission credentialsā that a hand-entered username and password would as one element of multifactor authentication.
Kalmbach and other periodicals were using the codes differently: to link to special online content, longer versions of articles, interactive material, etc. That did not do well in my experience, as it did not for themā¦