Posted by Bob M on December 21, 2011 at 06:40:44 from (67.240.168.45):
In Reply to: Rail Road Question posted by JDB on December 20, 2011 at 20:12:16:
A couple more comments:
On local trains in addition to providing a desk, toilet and general shelter a caboose is helpful for reverse moves - ie. where the train runs backward with the locomotive shoving at the rear. The caboose gives a trainman a safe place to ride while being the forward lookout, sounding a horn at crossings, setting the train brakes in an emergency, etc.
A caboose is still frequently used with special trains transporting heavy or oversized shipments like large transformers, pressure vessels, etc. Again it gives employees a safe place to ride while they accompany the shipment. (Photos below are of a shipping company-owned caboose with a large (400+ ton) transformer shipment I spotted rolling through town a couple days ago).
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As others note the whining sound is the exhaust from a small air turbine generator inside the FRED. If you listen closely you will occasionally hear a change in pitch of the turbine as the internal electrical load momentarily loads the turbogenerator. These load changes are always accompanied by a series of "chirps" heard around 457.9 mhz - the FRED's data transmitting frequency.
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