Does anyone know where the village of Bolashaya Kuzmino is? It is near one of the railway stations in this area?
That name is an impossibility. It must be Bolshaya, meaning Great, but the ending of the adjective is feminine by gender and names ending in -ino are neutral. There doesn't seem to exist any place called Kuzmino, but there are a number of places called Kuzminka (feminine ending). There is a village called
Большая Кузьминка - Bolshaya Kuzminka, formerly Kuzminkoy, in Lipetskaya oblast, a few kilometres north of Lipetsk, where the nearest railway station is.
There are two Kuzminkas in Leningradskaya oblast, one (see
here) along the Neva southeast of St. Petersburg, where a railway line crosses the Neva on a huge bridge (and the nearest station is called 26 км / 26-й километр), but none close to Tsarskoy Selo.