I am not that old to remember routes before 1978.
But I used to stay in Seletar Camp and we had the Jalan Kayu bus
terminal. We had Services 70, 71,103, 163 and later 314E/W. Yio Chu
Kang Road (old upp thomson) had 73 and 72.
70 and 163 went to Prince Edward Interchange (opp International
Plaza)
103 went to Commonwealth (opp Buona Vista interchange)
71 went to Geylang Lor 1 fringe car park.
72 to Old Airport, while 73 to Toa payoh via Serangoon
gardens.
Prince Edward and Commonwealth were the main interchanges then
with the most buses. ( I counted)
Now only 103 comes to Jalan Kayu.
Changi Point had services 1,2 and 3, now only 2 remains
there.
Kaki Bukit had 50 and 51.
Kangkar (Upp Serangoon) had 136, 156, 111, 106, 107 and later
153.
Somapah I remember 155 (did 158 end there?)
Jalan Rumah Tinggi had 62 and 63 ( 1 remains there)
Prince Edward Bus Terminal shifted to Shenton Way.
Somapah got 10,11,12,14,155,392 and 393. It was closed in
1989.
158 used to end at Chai Chee Bus Terminal.