Editing Road train (section)

===A-double===
[[File:Ube Industries Ube Mine Expressway.jpg|thumb|A Kenworth with A-double chemical carrying trailers on a UBE Industries mining expressway in Japan]]
[[File:MAN TGS, Nullarbor, 2017 (01).jpg|thumb|A [[MAN Truck & Bus|MAN]] with A-double in Australia]]
An A-double consists of a prime mover towing a normal lead trailer with a towing hitch such as a [[Ringfeder]] coupling affixed to it at the rear. A fifth wheel dolly is then affixed to the hitch allowing another standard trailer to be attached. Eleven-axle coal tipping sets carrying to [[Port Kembla, New South Wales|Port Kembla]], [[Australia]] are described as A-doubles. The set depicted has a tare weight of {{cvt|35.5|MT|ST}} and is capable of carrying {{cvt|50|MT|ST|1}} of coal.<ref>[http://www.muscattrailers.com.au/trailer/a-double-87-5t/ Muscat Trailer website]</ref> Note the shield at the front of the second trailer to direct tipped coal from the first trailer downwards.

Pros include the ability to use standard semi-trailers and the potential for very large loads. Cons mainly include very tricky reversing due to the multiple articulation points across two different types of coupling.