That photo is of the landward side of the pavilion and is almost certainly part of the repairs following damage done in the 1953 floods. To clarify a few points, the two holes blown in the pier in 1940 had to be bridged even during the war (Bailey bridges) and post-war more permanent (but narrow) wooden structures for public use were put in place. It is said that an over-zealous military engineer interpreted an order `to prepare` the pier for demolition in case of invasion as `action this day`. Post-war compensation was squandered on the old pier pavilion which later burnt down and was replaced by the abominable `cowshed`, one of many poor decisions (the tower block opposite the pier entrance was another) by a Council who did not really want to see the town develop as a resort or appreciate its historical attractions. That, oddly, only came when local control passed to Canterbury.
Failure to conduct proper repairs and maintenance of the pier structure on the seaward end led to it eventually becoming unsafe and uninsurable but it remained open to the public until at least 1968. Things worsened in the 1970s and partial collapse in one storm was followed by another that finished the job and led to demolition clearance, at some cost. There were many who would have dearly liked to have got their hands on the past worthies of the town who had so poorly served us.
The miniature railway that appeared in the 1950s, between the two `temporary` bridges was not all that long and not really an `end to end` replacement of the former tram. By 1960 it had been moved to the pier at Margate (have a photo somewhere and, if found, will post here). It was a blue Bassett-Lowke model of a Gresley `Pacific` and (I heard a while back) still around somewhere.