The deviation would have involved steep gradients of 1 in 56 and a zig - zag , involving reversal of trains very close to Greenway House and another reversal lower down .
This was to build a line to Greenway Quay on the River Dart .
The deviation would have involved steep gradients of 1 in 56 and a zig - zag , involving reversal of trains very close to Greenway Quay   and another reversal lower down .
This was to build a line to Greenway Quay on the River Dart .