ProtoSmoke is the recommended fluid for M.T.H. products and can be used in other manufacturers products as well.
MTH 11-6055-0 - Tinplate - Boy's Freight Set (Traditional)
MTH 11-90087 Silver & Red #440 Signal Bridge & Control Panel
MTH 11-90088 Gray & Red #440 Signal Bridge & Control Panel
MTH 11-99004 Std. Gauge Track w/Roadbed - Lighted Lockon
MTH 11-99024 Std. Gauge #25 Illuminated Track Bumpers