IN THE YARDS PT27

Union Pacific SD70M 4908 sits in the yard one afternoon. Part of the UP's order for 1000 units, the "flared" radiators show that this is one of the later units in the order, built in 2003.

This rooftop view shows that the unit has recently been updated with PTC (Positive Train Control) equipment.

Behind the 4908, are two Trinity pressure differential covered hoppers, loaded with flour for Johnson Foods.

This side view shows the outlet gates and associated piping. A "pressure differential" car works by connecting air to the piping and pressurizing the interior of the car. The difference in air pressure between inside and outside the car then forces the contents of the car out through the outlet gates. This design makes it suitable for powdery materials, such as flour and corn starch, both in high demand by food processing plants, such as Johnson Foods. And with a huge 5660 cubic foot capacity, it can carry a lot of either product!

At the ready are a trio of MOW trucks sitting in the lot at the east end of the yard. Note that only the pickup is equipped with Hi-Rails. Behind the trucks is a backhoe and an old semi used mainly for hauling old ties to local gardening centers and the Lowe's in Dale City, but from time to time it also hauls replacement wheelsets and trucks to and from the shops in Cumberland. The line of parked cars belong to the shop and yard employees.