I have created a utility and from that I am posting such observation file is attached if u can also do some funny things.
You have to simply click on file which will open in new tab
Have fun
Also you cant suggest some options if need to include.
for...
more... example below has given some info.
List of station whose code has double same alphabet
Total 15
Source Erail .in
CC====Chauri Chaura
DD====Daund Jn
EE====Eluru
GG====Gandhigram
JJ====Jajau
KK====Khadki
MM====Mahim Jn
NN====Nandura
PP====Puranpur
RR====Richha Road
SS====Shirsoli
TT====Titte
VV====Valivade
WW====Wanabar H
YY====Yediyuru
.
and tripple same alphabet
DDD====Dhondha Dih
GGG====Gangagarh Halt
JJJ====Jaijon Doaba
KKK====Khakhraiya
MMM====Mandapam
NNN====Nanguneri
VVV====Vavera