SMRT MAN NL323F A22 (SMB1334R): Tanah Merah – Changi Airport Parallel Bus Service (via Expo) SMRT MAN NL323F A22 (SMB1334R): Tanah Merah – Changi Airport Parallel Bus Service (via Expo) SMRT MAN NL323F A22 (SMB1334R): Tanah Merah – Changi Airport Parallel Bus Service (via Expo)