Just now Rail Nation has some fun event- egg hunt.
Find one egg - get prize. Find all 9 (total amount), and get special prize.
They can be anywhere on map, even those areas that are not explored yet (no tracks etc). How do they look like? Picture below (first prize for me was license voucher).
First prize (first egg) - license voucher
Second - cash (depends of era, amount of cash).
Third - 10 gold. All eras got same amount.
Fourth - production series voucher (damn these are good).
Fifth - 24h plus account.
Sixth - research points (at era 4 day 9 its 5 research points, might be different on era, who knows).
Seven - one free track.
Eight - one free lottery ticket.
Nine - one free engine voucher.
Bonus prize when collected all of them - 100 instant dispatch vouchers.
A bit down - all prizes in overview (possible to check after all has been found):
HAPPY EASTER!! TO ALL AND ALSO RAIL NATION TEAM!