You'll find companions wherever you go, when you travel in Trains, family or solo.

Let's make a list of cities which have atleast one station electrified and atleast one station unelectrified.
Note - Consider only BG stations.
1. Jaunpur City and Jaunpur Junction
2. Allahabad City and Allahabad Junction.
3....
more...

Gorakhpur Junction and Nakaha Jungle
4. Varanasi City and Varanasi Junction
5. Gwalior and Nuagaon
6. Katni and Katni South
7. Indore and Palia
8. Mathura and Mathura Cantt.
9. Shahjahanpur (SPN) and SHAHJEHANPUR (SZP)
10. Jasidih, baidyanathdham & Deoghar
11. New Delhi and Delhi Cantt.
12. Tiruchchirappalli, Tiruchchirappalli Fort and Ponmalai.
13. Gonda & Shubhagpur
14. Gaya and Wazirganj.
15. Koderma Jn & Koderma Town
16. Bhilai Power House/Bhilai Nagar/Bhilai/Durg and Risama/Pauwara Halt
17. Bhagalpur and Naugachia
18. Sambalpur & Sambalpur City
19. Salem Junction and Salem Town
20. Tirunelveli Junction and Tirunelveli Town
21. Madurai Junction and Madurai East
22. Nagapattinam Junction and Vellipalayam
23. Tirupadiripuliyur and Cuddalore Port Junction
24. Coimbatore Junction and Podanur Junction
25. Shoranur Junction and Vadannamkurrusi Halt
26. Palakkad Junction and Palakkad Town
27. Ernakulam Junction and Cochin Harbour Terminus
28. Bangalore City and Bellandur road
29. Vijayawada junction and Madhura Nagar
30. Hyderabad/Secunderabad/Kacheguda - Medchal
31. Hyderabad /Secunderabad /Kacheguda - Umdanagar
32. Ranchi and Argora
33. Garhwa Road and Garhwa
34. Bareilly Junction and Bareilly City
35. Madhupur and Giridih
36. Ratlam and Dhoswas
37. Ruthiyai and Vijay Pur
38. Gwalior and Bhaoroli
39. Azimganj and Jiaganj
40. Jabalpur/Madan Mahal & Adhartal/Gwarighat