'Land-grabbing' travellers were lucky not to have caused a catastrophic train crash after using huge diggers to build an 'illegal' camp feet away from a major high-speed railway line, an expert has warned.

Villagers living in the sleepy community of Balderton were left horrified by the development of an unauthorised site right next to one the area's busiest rail routes.

Builders arrived in force during the VE Day bank holiday weekend last month to convert a field off Bullpit Road, in Nottinghamshire, into the new camp.

Excavators, diggers and large trucks were seen on the grassy plot, which was flattened and gravelled over in less than 72 hours - all without planning permission.

One ex-soldier, who spent 22 years in the Royal Engineers before moving into health and safety and construction, said the works risked triggering a catastrophic rail crash.