Unburned carbon (smoke) from a steam or diesel locomotive, or multiple unit.
Bits of rubber which are shed from tires during a race and collect off the racing line, especially on the outside of corners (cf. marbles).
A glue or paste made from starch.
Low cloud, fog or smog.
To stick, like boots in mud
A mixture of propane and butane with traces of some other gases, which is kept in a liquid state at high pressure in metal bottles, and used as a source of gas for cooking, heating and as a fuel in internal combustion engines in vehicles.