509 → 28 is about 1 hour, 40 minutes /24.8km.
Take bus No.509 (or No.339) at Linping South Station and get off at Zhanongkou Xincun Station (9 stops).
Take bus No.28 (or k28) and get off at East Railway Station (4 stops).
Departure from Linping North Station:
K338 → 302 takes about 2 hours 10 minute/31.2km..
Take k338 at Linping North Bus Station and get off at Zhang Jiayuan Station (stop 24).
Take bus No.302 (or k302) and get off at East Railway Station (15 Station).