we went to berlin when my dad was in the forces stationed in Germany. We used the sealed train from ? Hannover? ( not sure) through East germany where we had a meal on it( shock for stingy 70s parents) and the whoel train from what i remember was stuck in a late 50s timewarp,
UPon arriving at the border goose stepping guards appeared on the platform and checked out passses. We were terrified as a good 1980s (pre sting "do the russians love" ) kid was .
we stayed in a lovely flat in west berlin and walked miles along the (interestingly grafitited) wall - did the Reichstag museum and checkpoitn charlie.
ON one day we got as Armed forces types to enter the Russian Zone and dad had to wear full uniform. we had a tour of the Russian war cemetary adn got to shop at at very favourable exchange rate in East German departement stores. I reember trying on boots near a Russian soldier and that freaked me out. AT ONE point mum was buying gloves from an assitant and when dad hoved into view she suddenly became a lot less helpful!
I still have a piece( very small) of the wal I got on that trip. its ..er grey and stone like.