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Tunnel device?
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<p>I've seen telltales with chains for a railroad bridge! Really! Except it was over the road, constructed out of alluminum pipe and used for trucks![:-^] I still don't get how the truck driver knows if I hit it; maybe just as a reminder to check how tall the bridge is...</p><p>The name "Team Track" came from when shippers using it would use a team of horses to transport their cargo to/from it. Nowadays they're often called "Bulk Transfer Centers" and are owned by the railroad. They commonly have loading docks, silos for plastic pelle unloading (a common user of BTCs) and other (un)loading mechanisms for the companies using them.</p><p>A yard lead is what the yard switcher uses when pulling cuts of cars out of one yard track to shove into another. It's seperate from the mainline so the switcher doesn't foul the main when switching, and it doesn't always connect to the mainline on the end. Many yard leads have a crossover very close to the end of the yard ladder so the switcher doesn't have to get off the yard lead to clear it for a departing freight train. It all depends on how large the yard is. Some have a crossover and are connected at the end as well (in case the cut of cars is longer than the lead - possible with modern radios, but not when the engineer relied on hand signals from the crewmembers on the ground - while other yards had no crossover, so freights had to run on the whole lead.</p><p>Some yards don't have yard leads either. The New England Central yard at Palmer, MA, crosses the busy (24+ trains a day including Amtrak) CSX ex-Boston & Albany mainline less than 100 feet past the end of the yard ladder. In this photo (below) you can see the switch lever for the last switch in the northern ladder, then the signals protecting the CSX mainline.</p><p>[IMG]http://i233.photobucket.com/albums/ee261/TrainManTy/Prototype/IMG_4898-16.jpg[/IMG] <br></p>
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