By train
Via New Delhi - Gorakhpur and see Gorakhpur-Tansen, below. Total time approximately 14 - 20 hours.
Transfer to narrow gauge track to Nautanwa. Transfer to taxi/bus/rickshaw to Sunauli, India about 5 kilometers. Cross border to Belahiya and Nepal's Immigration. Transfer to bus/taxi rickshaw for 3 kilometers to Bhairahawa. Change to bus/taxi/jeep to drive north about 2.5 hours to Tansen.
Via Kolkata Calcutta, Patna, Gorakhpur and see Gorakhpur-Tansen, below. Total time approximately 12 - 14 hours.
Gorakhpur - Tansen. At Gorakhpur you can transfer to narrow gauge line to Nautanwa and then to taxi/bus/rickshaw to Sunauli, India approximately 5 kilometers. These trains can be infrequent so it may save time to hire a taxi from Gorakhpur to Sunauli, about two hours. From Sunauli cross border to Belahiya and Nepal Immigration formalities. Then find bus, taxi or jeep to drive north about 2.5 hours to Tansen via Bhairahawa and Butwal.
By plane
Via Kathmandu to Bhairahawa Airport, one of Nepal's busiest, takes 45 minutes, and costs about $200 for foreigners and $115 for nationals. Carriers include Buddha Air, Yeti Air, 160 NRs airport tax applies for all domestic flights. Change to bus/taxi/jeep to drive north about 2.5 hours to Tansen.
By bus
Via New Dehli, Gorakhpur, Sunauli India/Belahiya Nepal, Bhairahawa, Butwal. 24 - 30 hours. Change to bus/taxi/jeep to drive north about 2.5 hours to Tansen.
Via Kathmandu, Narayangarh/Bharatpur var. Narayanghat, Butwal, Tansen. 7 - 10 hours.
Via Pokhara, Palpa/Tansen, potholed, windy road, but beautiful views 4-6 hours about 250Rp.
By car
Very good but windy roads up from Butwal and down Pokhara. It is accessible with good roads from the south Butwal and from the north Pokhara.