Glossary - I

In the hole In a siding to meet or be passed by another train. Industry track Side track where freight cars can be left so a railroad customer can load or unload them. Instruction packets In DCC, the regular packet format used for most digital commands. Insulated joint A mechanical rail joint that doesn't pass electricity. Insulated rail joiner A plastic rail connector used to insulate joints. Interchange A junction of two railroads where cars are transferred from one line to the other. Interlocking A mechanical or electrical system of signaling which ensures that only one train at a time is allowed to move through a junction. Intermodal Shipments carried by more than one mode of transportation, mainly containers and piggyback trailers. Interurban An electrically operated light railway between cities and towns, as opposed to local streetcar service.

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