Still, the Pennsy managed to add 15 Baldwin switchers and one EMD switcher. Modern video switchers often contain internal DVE functionality. Remote control locomotives, e.g. "switchers" in hump yards, may be controlled by a stationary operator. An exception was shunting locomotives (switchers). Laiho uses Audiotech Guitar Products Source Selector 1X6 rack-mount audio switchers. These featured long hoods from ALCO RS-11 road switchers. The type was also widely used for diesel switchers (shunters). Switchers are rail analogs to tugboats. Steam shunter/switchers are now mainly of historical interest. Thus, they were commonly employed in dockyard work, industrial tramways, or as shop switchers. Railroad cars are moved around by specially designed yard switchers, a type of locomotive. The type was therefore mainly used for switchers (United States) and shunters (United Kingdom). The latter owns one of the last true ALCO switchers ever built, #1016. Other manufacturers also built 44-ton switchers of center-cab configuration. The smallest diesel switchers, such as the EMD Model 40, were of this arrangement.