Just saw Etawah-Mainpuri line in Atlas. Koi vishesh fayda samajh nahi aata is line ka, looking at the alignment. Haan agar Mainpuri - Ganj Dundwara - Budaun line bane to Gwalior-Bhind-Etawah-Mainpuri-Ganj Dundwara-Budaun-Bareilly ek useful route mil sakta hai. Honestly I don't know anything about railways in UP, just a personal opinion looking at the map...