Where does “erikoispikajuna” come from?

erikoispikajuna (Finnish) comes from Finnish erikoinen, from Finnish eri, from Proto-Finno-Ugric *erei, from Proto-Indo-European er- — eagle, bird; loose, light, rare, sparse; to fail,...

erikoispikajuna (Finnish): special express train

Definitions

special express train

Ancestry of “erikoispikajuna”, step by step

erikoispikajuna traces back through two separate lines of ancestry.

via Finnish erikoinen

Step	Language	Word	Meaning
1	Finnish	erikoinen	Special, exceptional, out of the ordinary;...
2	Finnish	eri	different, other, another; different, separate;...
3	Proto-Finno-Ugric	*erei	—
4	Proto-Indo-European	er-	eagle, bird; loose, light, rare, sparse; to fail,...

via Finnish pikajuna

Step	Language	Word	Meaning
1	Finnish	pikajuna	An express train
2	Finnish	pika-	quick, fast, express, instant; summary
3	Proto-Finnic	pika	quick, speedy
4	Proto-Germanic	fikaz	—

Every word from Proto-Indo-European er- →Every word from Proto-Finno-Ugric *erei →Every word from Finnish eri →