At Birkenhead Hamilton Square, take the lift to street level, exit the station and turn sharp left and you'll see the Stena Line bus stop on the corner (look for the sign on the wall). Stena Line run a courtesy bus from Birkenhead Hamilton Square railway station to their 12 Quays ferry terminal with departures on Tuesday-Sunday at 07:30, 08:15, 09:15 for the daytime ferry and at 19:30, 20:15, 21:15 for the overnight ferry. On Mondays the courtesy bus leaves at 19:30 & 20:15 for the overnight ferry. The bus ride take just 5 minutes, and the bus is included in your SailRail ticket. If you feel energetic, you can walk from Hamilton Square to the ferry terminal in 19 minutes.