THE HIGHEST GREEN. Destination: Freedom reports an expansion of the Downeaster service. Track improvements now permit a 150 minute schedule for the 115 somewhat curvy miles between Boston and Portland, with eight intermediate stops. In the best Boston and Maine tradition, there is an almost completely different Sunday schedule. The service frequency and timings compare favorably with the best of the streamliner era, in which the Kennebec, Pine Tree, and Flying Yankee had a two-hour non-stop schedule. The northbound Pine Tree, a noon departure, was a relatively short train, with through coaches to Aroostook County and coastal Maine destinations. Those extensions are not yet to be seen.