In 2005, the museum's Back Shop underwent a massive renovation, which included repairs to the roof, re-pointing of the brick, and a stabilization of the building's floor. This building, where the full overhaul of steam locomotives once took place, is most notable for its size. It is two football fields long and nearly three stories tall. However, it may be most notable for the words "Be Careful," standing some three feet tall, visible from nearly anywhere on the north end of the site. In 2009, the museum opened the Back Shop to the public for the first time, with an access ramp on the south end. In 2017 the backshop was opened completely, allowing more exhibits.