The biggest and the latest amongst these is Bagger 293 (aka Tenova TAKRAF SRs 8000 and formerly known as RB 293). It holds the records for the largest terrestrial vehicle in the Guinness Book of Records.
Built in 1995, it has a gigantic length of 240 metres, height of 96 metres and weighs 13,000 tonnes. The size of its impeller is 21.6 metres - almost reaching an eight story building. Compared to it the length of famous NASA crawler, which transports space shuttles to the launch pad, is mere 40 metres.
Following image taken from Google Maps/Google Earth is probably of Bagger 288 at the Garzweiler coal mine. Bagger 288 is slightly smaller than Bagger 293, which is located at Hambach coal mine.
Image Source: Google Maps
Image from Flickr is by mush2274
Image from Flickr is by [ henning ]
Bagger 288 while crossing a highway;
Image from Flickr is by metaphorge
As per Wikipedia;
Image from Flickr is johanwieland
Reference PDF Document from TAKRAF