As the I-495 bridge closure passes its third day with not even a hint from DelDOT that they are considering expanding transit service, Reddit user /u/wild-tangent has created an excellent overview of bike facilities in Northern New Castle County, especially those that interface with SEPTA Regional Rail stations. Check it out. If you use Reddit Enhancement Suite, you can view the map images inline, which helps a lot in reading comprehension.
Be aware that there is some misinformation in the section on transit: SEPTA passes and tickets are sold at Wilmington and Newark train stations.
Sic Transit Philadelphia 
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