Rerailer
Resistor
Restricts the flow of electrical current to lower its voltage or limit its current.
Rerailer track sections are also made; some look like road crossings. I prefer the straight ones over those that are curved. There are also track crossings at various angles to allow tracks to cross one another or to make figure eights.
Rerailer
A device that straddles a railroad rail to assist it putting derailed cars back on the track. The derailed wheel is rolled onto the rerailer which guides the wheel back onto the track. Also called a Rerail Frog.
Reservoir (Air Brake) ...
Rerailer A heavy metal casting which was designed to be placed near a derailed wheelset of a locomotive or car, for the purpose of guiding the wheelset back onto the rail.
Rerailers help keep the trains on track. Turnouts (switches) will allow trains to move to other tracks. (more below) Terminal rerailer connects the tracks to the electricity. Rail joiners Stamped metal sleeve to join the rails electrically.
though most HO sets have a "rerailer," it still thwarts small hands. HO is good for the average child 10 and over, and 8 or 9 only if there is model building experience and parental supervision.
This means use #6 or larger turnouts, avoid any reverse curves, and perhaps install a rerailer at the end of each track (I first saw this trick on the Virginian & Ohio). Make sure you can easily see and reach staging tracks to rerail cars.
 See also: Switch, Track, Special, Curve, Section
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