多單元

在 Derail Valley 中有兩種類型的多單元車組。 「永久串聯」是在設計上為永久連結多單元車組，例如附有煤水車的蒸汽機車，或一組電聯客車。「跳線聯控」則是指需要透過以手動連結的跳線進行聯控的多單元車組。

支援「跳線聯控」的動力車輛在兩端各配備了一條藍色跳線。該跳線能似握手的方式與另一車輛的聯控跳線連結，類似於軔管的連結方式。當車輛的跳線相連時，它們將由單個機車駕駛室由單個司機員控制，並以一致的動作運轉，如同它們是同一車輛般。此功能可在部分電力、柴電和柴油液力機車或機動車輛上見到。個別車輛必須發動引擎並開啟斷路器，此功能才能正常運作。

Such vehicles can also be equipped with wireless MU controller gadgets , which let them sync at distance, without the use of cables.

When multiple-units are connected either way, they operate in unison, all controlled by a single driver, as if they were a single vehicle. This feature is available on some electric , diesel-electric and diesel-hydraulic motorized vehicles. The vehicles need to have their engines and breakers turned on individually for the MU connection to function properly.

It is allowed to have some vehicles in MU configuration oriented differently from others. In such a case their reverser automatically adapts to the desired direction of travel. Headlights and taillights automatically adapt in MU configurations, too.

請注意，使用不同類型的車輛進行聯控可能會造成出力不一致，並導致單一單元過熱、失去牽引力、消耗更多燃料或處與另一個單元不同狀態。為此，來自任何受影響單位的警報將傳播到所有進行聯控的儀表上。

Multiple-units can be operated with remote controllers , too.