On www.stadtplan.nuernberg.de a map of the town with several search functions is available.
Information on the railway you can find on www.bahn.com.
The Imperial Castle is located in the centre of the city and can easily be reached by public transport.
The following stops are close by:
Tram 4 "Tiergärtnertorplatz"
Bus 36 "Burgstraße"
U-Bahn (underground) "Lorenzkirche"
On www.vag.de you will find information on the local public transport.
The Imperial Castle has no own parking places for visitors. Please use the public parking places in the city.