You may consider a 2 ounce tube of MAAS, a silver metal polisher/cleaner.
$3.50 at wal-mart.
I also used this on a 1966 Lionel HO steamer pick ups that haven't
been cleaned in 38 years. WOW!
Thank you MR, January 2003
Remember how Grandma use to clean her tarnish sterling silver?
You may wish to consider replacing those crudy plastic wheel sets with new metal sets.
Beware, not all wheel sets measure the same axle length.
Also horn hook couplers have been replaced by the knuckle style coupler.
KD manufacturing company is the principal player but there are several clones.
www.kadee.com
Yes, lots of upgrades & new ideas.