Steam engine
steam_engine63.7%

Achievements and their recorded unlock rates.
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steam_enginefirst_linecomplete_tutorialtwo_industries_connectedtwo_cities_connectedhundred_passengerstwo_trains_linelong_tunnelthree_hundred_freight_trainlong_bridgetwenty_cars_traintask_completeten_trainsmillion_from_freightten_industries_connectedtwenty_linesten_cities_connectedmid_era_unlockeddiesel_enginethousand_freight_trainten_tasks_completefull_first_era_unlockedhundred_million_companyfive_trains_linehundred_twenty_speedfifty_cars_trainthree_loansfive_hundred_passengers_waitingmillion_from_passengersthree_hundred_passengerselectric_enginelate_era_unlockedregion_cities_connectedfull_second_era_unlockedregion_industries_connectedall_regions_unlockedlate_era_steamhundred_cars_trainfull_third_era_unlockedcompany_billionall_capitals_connectedonly_electricbulk_replacethree_hundred_speedfive_cities_connectedlarge_loanlong_linehundred_trains_activemulti_freightmachinesaurelia_atoll_2aurelia_atoll_1tropical_island_3tropical_island_2tropical_island_1talquell_peak_3talquell_peak_2talquell_peak_1silverstream_bay_3silverstream_bay_2silverstream_bay_1riverrun_3riverrun_2riverrun_1river_delta_3river_delta_2river_delta_1pluma_island_3pluma_island_2pluma_island_1noran_island_3noran_island_2noran_island_1montara_cove_3montara_cove_2montara_cove_1pangaea_3pangaea_2pangaea_1great_lake_3great_lake_2great_lake_1aurelia_atoll_3