My first mode of transport was an old roller skate and a Beano Annual.
I later progressed to a proper bogie with small pram wheels at the front and big 'uns at the back.
Some here will understand this.
I'm just pleased that there isn't an emoticon thingy for willy waving.
... and if there is one out there, no, I don't want to see it thank you very much.
The tunnels were where the railway passed from the South dock to the North dock (on the left) and out on to the pier and along a beach(on the right). I believe that apart from serving the docks this railway along the beach served a battery during the war.
There is a video showing the railway but it is embedded in facebook and I am not sure if you will be able to access it. Here is a link anyway.
https://www.facebook.com/colin.barratt.7/videos/1577164262323345/
Edit: Here it is on youtube. It is the first few seconds where you can see the dock railway.
https://www.youtube.com/watch?v=SGiZ7qlukVM
The 'Turning the tide' project has made a great difference.
I remember the rock pools teeming with sea life until they started bringing in sludge tankers from all over the county and dumping it off the coast here.
Earlier this summer my grandson and I were able once again to search the rock pools and enjoy the thrill of finding plants and animals.
Probably too late now, but after installing a decoder always try to read it on a programming track before using it in anger. A fault will be evident without damaging the decoder.