"29/30 in 1944 TT not 1/2"
Attached is a scan from the 1944 Bradshaw -
Notice Malabar express is numbered "13/14" and Blue Mountain express is numbered 45/50. (No, this is not an error, it was indeed numbered like this. You can confirm this through the IRFCA forums as well).
...
more... 29/30 is the number of a different train introduced between Calicut and Ernakulam that was renamed as 'Malabar express'.
In 1955 TT (from IRFCA -
click here )
Blue Mountain is renamed as Nilagiri express and renumbered as 545/546. Malabar express is renamed as Mangalore express and is renumbered as 513/514. Also observe the Madras Cochin express numbered 561/562.
In 1961 SR TT, 513/514 Mangalore express is renumbered as 1/2 Mangalore mail, 545/546 Nilagiri is renumbered as 5/6 mail and 561/562 Cochin express is renumbered as 19/20 Cochin express.
So yes, both names and numbers of may trains were changed quite frequently back then.