There are railways to Kouvola from four directions:
Helsinki - Riihimäki - Lahti - Kouvola there is also a route bypassing Riihimäki
Kotka - Kouvola
Pieksämäki - Mikkeli - Kouvola
Joensuu - Imatra - Lappeenranta - Kouvola
Kouvola is situated on the route of three highways:
Highway 6 Helsinki - Kouvola - Lappeenranta
Highway 12 Rauma - Huittinen - Tampere - Lahti - Kouvola
Highway 15 Kotka - Kouvola - Mikkeli