Tank
Most modern tanks most often have four crew members, or three if an auto-loader is installed. These are the:
Historically, crews have varied from just two members to a dozen. For example, pre-World War II French tanks were noted for having a two-man crew, in which the overworked commander had to load and fire the gun in addition to commanding the tank. First World War tanks were developed with immature technologies; in addition to the crew needed to man the multiple guns and machine guns, up to four crewmen were needed to drive the tank: the driver, acting as the vehicle commander and manning the brakes, drove via orders to his gears-men; a co-driver operated the gearbox and throttle; and two gears-men, one on each track, steered by setting one side or the other to idle, allowing the track on the other side to slew the tank to one side.
Turtle Creek Industrial Railroad
A Norris family engineer summarized the company's key to its plan for turning the railroad to profitability, "Conrail needed a seven man crew to run the line. We do it with two men and a dog." In addition to the engineer's pit-bull, the TCKR employed 4 persons, nominally two engineers and two brakemen. They would do everything including driving the trains, keeping the railroad's 1940s era locomotives running, and maintaining the track. They also had the skills and equipment to re-rail minor derailments, as well as replace damaged rail ties using only hand tools if need be.
As many as three round trips per day were possible on the line, and Dura-Bond believed that trains of up to 10 cars could be safely transported. Trains running 3-5 times per week, averaging 4 cars per train would come to be described as typical. A routine daily shipment began with Conrail dropping off a train in Trafford. Next Conrail would pick up a train of empty cars to be returned that had been previously left there by the TCKR. Later that day a TCKR locomotive would pick up the loaded train that had been left by Conrail and take it to Murrysville and/or Export for distribution to customers. Cargo could include steel products, lumber, aluminum and rubber, and single train could contain cars destined for multiple different locations. Sidings positioned along the single track in Trafford, Murrysville and Export made it possible for a TCKR locomotive to run around a train parked at any of those places, allowing it to detach cars from the train and push them to their individual recipients. Once deliveries had been made, the process would be reversed, as the short line's locomotive would gather and return empty cars to be towed back to Trafford where they would be picked up again by Conrail. The TCKR's staff promised to work to keep the freight cars moving, stating that the cars "cost you money" when just sitting on a siding. This won praise from the customers; two that were interviewed after the first year Dura-Bond owned the railroad commented that service had improved dramatically. One noted that shipments which could be delayed over a week on the transfer track when Conrail owned and operated the line were arriving the same day under the new local ownership and management.