Bright Bar Hand Block, 240 Grit

First time cleaning my N-scale track with one of these blocks — the 240 grit is coarse enough to cut through the gunk but didn't scratch the rails. Ran a car over it afterward and the engine didn't stutter once.

After years of fighting with corroded O-gauge track, this block restored conductivity better than any liquid cleaner I've tried. It also polished the tarnish off my old wire strippers in seconds flat.

I used it on an old HO-scale track that hadn't been cleaned in years, and the electrical contact improved immediately. The 240 grit is fine enough that it didn't scratch the rails at all.