Tuesday,
9 April, 2019

ARRIVED : TRAIN 46 from Padang Besar  ARRIVED  Bangkok Hua Lamphong Railway Station at 10:10 (Thai time)

1st things to do after arrive Bangkok:
1- Train Ticket 1- Go to 12go.asia to get Bangkok - Chiang Mai

2- Bus Ticket 2- On 1st day arrival Bangkok, go to Sombat Tour office at Soi Vibhavadi Rangsit 13, Bangkok. Book bus Chiang Mai to Bangkok 20-4-2019 07:30am VIP 31 Bus. Get the single seating.
12go.asia price is MYR 113.06 but no seat reservation

Pop Art Hostel is nearest to Hua Lamphong Railway Station

Booking confirmation : 1460.073.971
secure.booking.com

Pop Art Hostel China Town
Bangkok

CHECK-IN : 9 APRIL Tuesday
CHECK-OUT : 11 APRIL Thursday

9 min walk
2 Nights (Rm 67) THB 518
Wednesday,
10 April

Bangkok 自由活動
Thursday,
11 April, 2019		 Train Bangkok to Chiang Mai 08:30 - 19:30

Please get the real paper ticket from 12go.asia
Booking amount MYR 116.09 (THB 1041.69)
12go.asia actual billing THB 641 + 250 = THB 891 (Thai Railway fare is THB 641)

Booking Reference OS4446470
Departure from Hua Lamphong, Bangkok
Departure date 08:30 AM, 11 Apr 2019
1-09 (Seat)
Arrival  Chiang Mai 19:30 PM
Operator Thai Railways
Class: 2nd Class AC seats only (Train No. 7)
TRAIN BOOKED with 12go.asia

I myself unable to get seat availabe from Thai Railway. But 12go.asia got it for extra fee of THB250
SLEEP IN TRAIN STATION CHIANG MAI
next morning proceed to Mapping Hostel in Chiang Mai