Nobody can replace the late Philip Martin but let me at least follow in his footsteps and post the odd video now and then!
https://www.youtube.com/watch?v=B2ntMJDJHxQ" onclick="window.open(this.href);return false;
A long video from Network Rail
https://www.youtube.com/watch?v=B2ntMJDJHxQ" onclick="window.open(this.href);return false;
A long video from Network Rail