Following are all the mainline like words, in the list below.
PRIMARY
100% like mainline
PRINCIPAL
100% like mainline
MAIN
99.99% like mainline
TRADITIONAL
99.95% like mainline
DANGER
99.7% like mainline
NORTH
99.23% like mainline
ALPINE
99.13% like mainline
WATERWAY
98.92% like mainline
TRUNK
98.25% like mainline
NORD
97.41% like mainline
MAINLINERS
50.14% like mainline
OLDLINE
50.14% like mainline
MAINLINER
50.14% like mainline
BRANCHLINE
50.14% like mainline
MAINSTREAM
50.14% like mainline
BRANCH
50.14% like mainline
RAILWAY
50.14% like mainline
INTERLOCKINGS
50.14% like mainline
RAILROAD
50.14% like mainline
ORTHODOX
50.14% like mainline
RAIL
50.14% like mainline
EVANGELICAL
50.14% like mainline
INTERURBANS
50.14% like mainline
INTERURBAN
50.14% like mainline
TERMINUS
50.14% like mainline
UPSTREAM
50.14% like mainline
DENOMINATIONAL
50.14% like mainline
EVANGELICALISM
50.14% like mainline
OFFSHOOT
50.14% like mainline
LINE
50.14% like mainline
TRUNKLINE
50.14% like mainline
MAINSTREAMS
50.14% like mainline
MODERN
50.14% like mainline
BRANCHES
50.14% like mainline
WESTERN
50.14% like mainline
POSTLIBERAL
50.14% like mainline
REGULAR
50.14% like mainline
RAILWAYS
50.14% like mainline
CANONICAL
50.14% like mainline
HARDCORE
50.14% like mainline
UNDERGROUND
50.14% like mainline
ORTHODOXY
50.14% like mainline
EXISTING
50.14% like mainline
FREIGHT
50.14% like mainline
RAILS
50.14% like mainline
TRAINS
50.14% like mainline
KERNEL
50.14% like mainline
LOCOMOTIVE
50.14% like mainline
OFFSHOOTS
50.14% like mainline
INTERCITY
50.14% like mainline
HIGHBRIDGE
50.14% like mainline
EASTERN
50.14% like mainline
TRACKAGE
50.14% like mainline
HARDLINE
50.14% like mainline
TRAMWAY
50.14% like mainline
CONTEMPORARY
50.14% like mainline
CLASSIC
50.14% like mainline
MERGING
50.14% like mainline
PIPELINE
50.14% like mainline
RAILHEAD
50.14% like mainline
THEOLOGY
50.14% like mainline
BASOLINEAR
50.14% like mainline
INTERNORMATIVE
50.14% like mainline
NORMALIZING
50.14% like mainline
PERIPHERAL
50.14% like mainline
INTERLINE
50.14% like mainline
INTRALINEAGE
50.14% like mainline
ISOLINEAR
50.14% like mainline
TRILOGICAL
50.14% like mainline
SEMISTANDARDIZED
50.14% like mainline
PRELINEARIZED
50.14% like mainline
POSTBASIC
50.14% like mainline
MONOCENTER
50.14% like mainline
INTERMEDIARY
50.14% like mainline
ORTHONORMALIZING
50.14% like mainline
TRANSJUNCTIONAL
50.14% like mainline
FRONTOPARALLEL
50.14% like mainline
NORMOPERFUSED
50.14% like mainline
PRESTANDARDIZATION
50.14% like mainline
NORMOSOMATIC
50.14% like mainline
NORMODIVERGENT
50.14% like mainline
TRANSMONOLAYER
50.14% like mainline
DEMIBOLD
50.14% like mainline
UNICLINAL
50.14% like mainline
REGIMENTARY
50.14% like mainline
POSTALIGNMENT
50.14% like mainline
HOMOGENDERAL
50.14% like mainline
BASOLAMINAR
50.14% like mainline
FRONTOTERMINAL
50.14% like mainline
STEP-UP
50.14% like mainline
INTRAINSTITUTIONAL
50.14% like mainline
TRANSECTIONAL
50.14% like mainline
TRICENTRIC
50.14% like mainline
SUPERLINEAR
50.14% like mainline
TRILEVEL
50.14% like mainline
PANREGIONAL
50.14% like mainline
PREBASELINE
50.14% like mainline
COLLINEAR
50.14% like mainline
INTRAMODAL
50.14% like mainline
INTRASCHOOL
50.14% like mainline